<template>
  <div>
    <el-divider content-position="left">Tree</el-divider>
    <el-row>
      <el-tree
         v-tree-connect
        :data="data"
        show-checkbox
        node-key="id"
        :default-expanded-keys="[2, 3]"
        :default-checked-keys="[5]"
        :props="defaultProps">
      </el-tree>
    </el-row>
  </div>
</template>

<script>
import treeConnect from '$ui/directives/tree-connect'
  export default {
    directives: {'tree-connect': treeConnect},
    data() {
      return {
        data: [{
          id: 1,
          label: '一级 1',
          children: [{
            id: 4,
            label: '二级 1-1',
            children: [{
              id: 9,
              label: '三级 1-1-1'
            }, {
              id: 10,
              label: '三级 1-1-2'
            }]
          }]
        }, {
          id: 2,
          label: '一级 2',
          children: [{
            id: 5,
            label: '二级 2-1'
          }, {
            id: 6,
            label: '二级 2-2'
          }]
        }, {
          id: 3,
          label: '一级 3',
          children: [{
            id: 7,
            label: '二级 3-1'
          }, {
            id: 8,
            label: '二级 3-2'
          }]
        }],
        defaultProps: {
          children: 'children',
          label: 'label'
        }
      };
    }
  };
</script>
